PHP and MySQL Web Development 4th Ed-tqw-_darksiderg

Implementing Bookmark Storage and Retrieval
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Looking back at add_bm.php, you can see that the last thing it does is call
get_user_urls() and display_user_urls(), the same as member.php. We look at
these functions next.
Displaying Bookmarks
The member.php script and add_bm() function use the functions get_user_urls() and
display_user_urls().These functions get a user’s bookmarks from the database and
display them, respectively.The get_user_urls() function is in the url_fns.php library,
and the display_user_urls() function is in the output_fns.php library.
The get_user_urls() function is shown in Listing 27.23.
Listing 27.23 get_user_urls()Function from url_fns.php—This Function
Retrieves a User’s Bookmarks from the Database
function get_user_urls($username) {
//extract from the database all the URLs this user has stored
$conn = db_connect();
$result = $conn->query("select bm_URL
from bookmark
where username = '".$username."'");
if (!$result) {
return false;
}
//create an array of the URLs
$url_array = array();
for ($count = 1; $row = $result->fetch_row(); ++$count) {
$url_array[$count] = $row[0];
}
return $url_array;
}
Let’s briefly step through the get_user_urls() function. It takes a username as a parameter
and retrieves the bookmarks for that user from the database. It returns an array of
these URLs or false if the bookmarks could not be retrieved.
The array from get_user_urls() can be passed to display_user_urls().This is
again a simple HTML output function to print the user’s URLs in a nice table format,
so we didn’t include it here. Refer to Figure 27.6 to see what the output looks like.The
function actually puts the URLs into a form. Next to each URL is a check box that
enables the user to mark bookmarks for deletion.We look at this capability next.